Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (5): 1015-1023.DOI: 10.3969/j.issn.1004-1524.2022.05.16

• Horticultural Science • Previous Articles     Next Articles

Isolation and identification of mycorrhizal fungi in rhizosphere and their effect on growth and photosynthetic characteristics of Eucalyptus globulus seedlings

WANG Xiaoli1(), ZHAO Yingwei2, KONG Xiaona1, CAO Zilin3,*()   

  1. 1. College of Forestry, Southwest Forestry University, Kunming 650224, China
    2. State-Owned Dongmen Forest Farm in Guangxi,Fusui 532108, Guangxi, China
    3. College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China
  • Received:2021-05-03 Online:2022-05-25 Published:2022-06-06
  • Contact: CAO Zilin

Abstract:

In Eucalyptus, Eucalyptus globulus is a specific species for oil and timber dual-use. In order to provide theoretical basis and practical guidance for the cultivation of sound seedlings of E. globulus from the perspective of mycorrhizal seedlings, rhizosphere soil of E. globulus was collected from Yunnan Province. The species and dominant species of mycorrhizal fungi in rhizosphere soil were investigated. The effects of the isolated mycorrhizal fungi on the growth and photosynthetic characteristics of E. globulus seedlings were analyzed by controlling the number of mycorrhizal fungi in the nursery substrate. The main species of mycorrhizal fungi affecting seedling growth were explored through gradual regression analysis. The results showed that six species of mycorrhizal fungi were isolated from the rhizosphere soil of E. globulus plantation, which were Glomus mosseae, Glomus aggregatum, Glomus multicaule, Claroideoglomus etunicatum, Septoglomus constrictum, and Glomus hoi. The dominant mycorrhizal fungi were G. aggregatum, C. etunicatum and G. mosseae, which accumulatively accounted for 80.77% of the total spore density. At 10 months of age, the infection rate and infection intensity of mycorrhizal fungi of E. globulus seedlings were increased with the increase of the number of mycorrhizal fungi in the nursery substrate. At the ages of 5 months and 10 months, the seedling height, ground diameter of E. globulus seedlings were significantly (P<0.05) elevated with mycorrhizal fungi in the nursery substrate, the light compensation point and light saturation point of E. globulus seedlings were significantly (P<0.05) reduced, meanwhile the chlorophyll content and apparent quantum yield were significantly (P<0.05) increased. The dominant species promoting the growth and photosynthesis of E. globulus seedlings were G. aggregatum, C. etunicatum and S. constrictum, which was revealed by the correlation analysis and stepwise regression analysis.

Key words: Eucalyptus globulus Labill, mycorrhizal fungi, isolation and identification, growth index, photosynthetic characteristics

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